The casinos know who has problems, just like they know they tamper with the air to make people feel more euphoric
How do they tamper with the air? Do they increase the level of oxygen? That's insidious! It would also make cigarettes burn faster, assuming people were allowed to smoke indoors.
Only, people are allowed to smoke indoors, as long as it is in a casino. See http://www.riverfronttimes.com... for example. (Note: not true of all locations and casinos; however, in general, casinos are able to carve out special exemptions for themselves.)